diff --git a/BizHawk.Client.Common/movie/conversions/MovieConversionExtensions.cs b/BizHawk.Client.Common/movie/conversions/MovieConversionExtensions.cs
index 60eb39e60d..d3df703aaa 100644
--- a/BizHawk.Client.Common/movie/conversions/MovieConversionExtensions.cs
+++ b/BizHawk.Client.Common/movie/conversions/MovieConversionExtensions.cs
@@ -1,6 +1,7 @@
 using System;
 using BizHawk.Common.ReflectionExtensions;
 using BizHawk.Emulation.Common;
+using BizHawk.Emulation.Cores.Nintendo.Gameboy;
 
 namespace BizHawk.Client.Common.MovieConversionExtensions
 {
@@ -116,6 +117,11 @@ namespace BizHawk.Client.Common.MovieConversionExtensions
 				}
 			}
 
+			if (Global.Emulator is Gameboy && (Global.Emulator as Gameboy).IsCGBMode())
+			{
+				movie.HeaderEntries.Add("IsCGBMode", "1");
+			}
+
 			movie.Core = ((CoreAttributes)Attribute
 				.GetCustomAttribute(Global.Emulator.GetType(), typeof(CoreAttributes)))
 				.CoreName;